:root {
  --bg: #060c12;
  --text: #eef5f2;
  --glow-blue: rgba(37, 99, 235, 0.30);
  --glow-green: rgba(16, 185, 129, 0.24);
  --dot: rgba(160, 200, 220, 0.34);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f2f8f6;
    --text: #0c1a24;
    --glow-blue: rgba(37, 99, 235, 0.16);
    --glow-green: rgba(16, 185, 129, 0.2);
    --dot: rgba(12, 40, 60, 0.18);
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(55vmax 55vmax at 8% 10%, var(--glow-blue), transparent 60%),
    radial-gradient(55vmax 55vmax at 92% 92%, var(--glow-green), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* Backdrop: dotted grid that fades out from the centre */
.backdrop {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--dot) 1px, transparent 1.5px);
  background-size: 30px 30px;
  -webkit-mask-image: radial-gradient(circle at center, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at center, #000 0%, transparent 70%);
}

main {
  position: relative;
  z-index: 1;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1.75rem, 5vw, 3rem);
  padding: 1.5rem;
  animation: rise 1s ease both;
}

.mark {
  width: clamp(170px, 36vw, 340px);
  height: auto;
  overflow: visible;
  filter: drop-shadow(0 0 36px rgba(60, 170, 200, 0.35));
}

h1 {
  margin: 0;
  font-size: clamp(1.4rem, 5vw, 2.4rem);
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  line-height: 1;
  /* balances the trailing letter-spacing so the text stays centred */
  padding-left: 0.28em;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  main { animation: none; }
}